2x^2+16x-42=0

Solution for 2x^2+16x-42=0 equation:

2x^2+16x-42=0

a = 2; b = 16; c = -42;
Δ = b2-4ac
Δ = 162-4·2·(-42)
Δ = 592
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

The end solution:

$\sqrt{\Delta}=\sqrt{592}=\sqrt{16*37}=\sqrt{16}*\sqrt{37}=4\sqrt{37}$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(16)-4\sqrt{37}}{2*2}=\frac{-16-4\sqrt{37}}{4}
$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(16)+4\sqrt{37}}{2*2}=\frac{-16+4\sqrt{37}}{4}
$