Question

2) Solve by completing square method.
x2 + x - 20=0.
Use the following steps
1) Find the value of b
2) x2 + x = 20 .................. 2 by eq" I
3) Add the value of Q' in both sides of equation
4) Find of which expression, L. H. S. is square.
5) Find square roots of both sides.
6) Write the roots.​

Answer 1

Answer:

the value of x is 4 and (-5)

• x²+x - 20=0
• x² +(5-4)x - 20=0
• x²+5x - 4x - 20=0
• x(x+5) - 4(x+5)=0
• (x+5)(x-4) =0

x+5=0

x= -5

or... x-4=0

x=4

Step-by-step explanation:

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