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

A test consists of 10

Alecsey [184]

I didn't understand your question. please repeat

6 0

3 years ago

In a 45-45-90 triangle, the hypotenuse is 7, find both the legs

Nadya [2.5K]

Answer: If the hypotenuse is 7, the other 2 sides are $\sqrt{24.5}$ 0r about = 4.95

Step-by-step explanation: in a 45-45-90 triangle, the legs are equal.

a² + b² = c² . 2(a²) = 49 a² = 49/2

So find the square root of 24.5

$\sqrt{24.5}$ =4.949747468 .round to 4.95

7 0

3 years ago