There's a special case of the quadratic formula called the Shakespeare Quadratic Formula (2b or -2b) that applies when the linear coefficient is even.

$x^2-2Bx + C \textrm{ has zeros }x = B \pm\sqrt{B^2 - C}$

If you're planning on solving a lot of quadratic equations quickly, it's good to know.

Here we have

$x^2 + 4x - 7 = 0$

$x = -2 \pm \sqrt{2^2 - -7}$

$x = -2 \pm \sqrt{11}$

8 0

3 years ago

If y= 1/2x and x= - 14, find y PLS HELPPPP

ExtremeBDS [4]

Substitute x with its value, -14
y=1/2 (-14)
y= -14/2
y= -7

7 0

3 years ago

Read 2 more answers

What is 30 percent of 25

sweet [91]

7.5 is 30 percent of 25 because

25 divided by 10 is 2.5 times 3 is 7.5

6 0

3 years ago