Question

1. Which of the following will simplify to the correct solutions of y = 2x2 + 5x - 7?

Answer 1

Answer:

Option B

Step-by-step explanation:

Given quadratic equation is,

y = 2x² + 5x - 7

By comparing this equation with y = ax² + bx + c

a = 2, b = 5 and c = -7

Solution of the polynomial (2x² + 5x - 7) can be determined by the quadratic formula,

$x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$

Substitute the values of a, b and c.

$x=\frac{-5\pm \sqrt{5^2-4(2)(-7)}}{2(2)}$

   $=\frac{-5\pm \sqrt{25+56} }{4}$

Therefore, Option B will be answer.