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Maths Gurus Pls Help Me Solve This Questions. by Nobody: 2:57pm On Jan 07, 2018 |
Please guys i need u to help me solve this questions. Please solve them step by step in a way anyone can understand. This was under quadratic equations. Please note that 2^3 means 2 raise to the power of 3. x^2 =25 i saw the answer to be -5,5 but i dont know how to solve it. x^2 - 9 _________ = 8 ....5 please guys solve it in a way i could understand. THE ANSWER IN the txtbook is -1 ____, 5 1 ___ 5. X^2 - 1 ........_____ = 0 ........ ..2 please dont mind the fullstop nairaland wont allow me to edit it well.the answer is -7,7 but it how to solve it that is important. Please i would appreciate if u could help me.Tnx |
Re: Maths Gurus Pls Help Me Solve This Questions. by Nobody: 2:59pm On Jan 07, 2018 |
Please guys i need u to help me solve this questions. Please solve them step by step in a way anyone can understand. This was under quadratic equations. Please note that 2^3 means 2 raise to the power of 3. x^2 =25 i saw the answer to be -5,5 but i dont know how to solve it. x^2 - 9 _________ = 8 ....5 please guys solve it in a way i could understand. THE ANSWER IN the txtbook is -1 ____, 5 1 ___ 5. ............... 1 x^2......-..___ = 0 .............. ..2 - means minus ^ means raise to the power please dont mind the fullstop nairaland wont allow me to edit it well.the answer is -7,7 but it how to solve it that is important. Please i would appreciate if u could help me.Tnx |
Re: Maths Gurus Pls Help Me Solve This Questions. by CoolFreeday(m): 3:30pm On Jan 07, 2018 |
I don't understand the .... you're using in the denominator. for the first one x^2 = 25 square both side √ ( x^2) = √25 x = -5,+5 |
Re: Maths Gurus Pls Help Me Solve This Questions. by OneCorner: 4:04pm On Jan 07, 2018 |
Simple question |
Re: Maths Gurus Pls Help Me Solve This Questions. by yinkacruxzy: 5:17pm On Jan 07, 2018 |
USE COMPLETING THE SQUARE X^2 -25=O...X^2 -(5)^2 =O....REMEBER THAT A^2 - B^2= (A+B)(A-B)...WE NOW HAVE (X+5)(X-5)=O...X+5=O OR X-5=O...X=-5 OR 5 |
Re: Maths Gurus Pls Help Me Solve This Questions. by Raintaker(m): 6:02pm On Jan 07, 2018 |
x2=25 Two solutions were found : x = 5 x = -5 Rearrange: Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation : x^2-(25)=0 Step by step solution : Step 1 : Trying to factor as a Difference of Squares : 1.1 Factoring: x2-25 Theory : A difference of two perfect squares, A2 - B2 can be factored into (A+B) • (A-B) Proof : (A+B) • (A-B) = A2 - AB + BA - B2 = A2 - AB + AB - B2 = A2 - B2 Note : AB = BA is the commutative property of multiplication. Note : - AB + AB equals zero and is therefore eliminated from the expression. Check : 25 is the square of 5 Check : x2 is the square of x1 Factorization is : (x + 5) • (x - 5) Equation at the end of step 1 : (x + 5) • (x - 5) = 0 Step 2 : Theory - Roots of a product : 2.1 A product of several terms equals zero. When a product of two or more terms equals zero, then at least one of the terms must be zero. We shall now solve each term = 0 separately In other words, we are going to solve as many equations as there are terms in the product Any solution of term = 0 solves product = 0 as well. Solving a Single Variable Equation : 2.2 Solve : x+5 = 0 Subtract 5 from both sides of the equation : x = -5 Solving a Single Variable Equation : 2.3 Solve : x-5 = 0 Add 5 to both sides of the equation : x = 5 Two solutions were found : x = 5 x = -5 |
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