Question

The solution to 2x2 – 11 = 87 is .

Answer 1

Answer:

x = 7, -7

Step-by-step explanation:

2x² - 11 = 87

2x² = 98

x² = 49

x = +/-7

Answer 2

Step-by-step explanation:

Step 1:  Subtract 87 from both sides

$2x^2 - 11 - 87 = 87 - 87$

$2x^2 - 11 - 87 = 0$

Step 2:  Factor

$2x^2 - 11 - 87 = 0$

$2(x + 7)(x - 7) = 0$

$x + 7 = 0$ and $x - 7 = 0$

$x = -7$ and $x = 7$

Answer:  $x = -7, 7$