Question

Solve x^2 - 9 = 8x. class10 ncert ch4

Answer 1

Answer:

Move  

8 x

to the left side of the equation by subtracting it from both sides.

x 2 − 9 − 8 x = 0

Use the quadratic formula to find the solutions.

− b ± √ b 2 − 4 ( a c ) 2 a

Substitute the values

 a = 1 ,  b = − 8 , and  c = − 9

into the quadratic formula and solve for  

x . 8 ± √ ( − 8 ) 2 − 4 ⋅ ( 1 ⋅ − 9 ) 2 ⋅ 1

Simplify.

Tap for more steps...

x = 4 ± 5

The final answer is the combination of both solutions.

x = 9 , - 1