Question

x2 -8x-7=0 by formula method​

Answer 1

Answer:

( X-8 ) (x²-1) suppose that answer is correct

Answer 2

Step-by-step explanation:

This is a quadratic equation. The formula for solving this is as follows:

-b± √(b²-4ac) ÷ (2a) .

In this equation, x² - 8x -7 = 0 , a = 1, b = 8, c = 7

Putting the values in the formula, we get

-8 ± √(8² - (4 × 1 × 7)) ÷ 2 × 1

=》 -8 ± √(64 - 28) ÷ 2

=》 -8 ± √ 36 ÷ 2

=》 -8 ± 6 ÷ 2

Now we have 2 results. -8 + 6 ÷ 2 and -8 - 6 ÷ 2

we will solve both.

-8 + 6 ÷ 2 = -2/2 ; - 8 - 6 ÷ 2 = -14/2

=》 -1 ; -7

So, x = -1 , -7 Ans.