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DanielleElmas [232]

4 years ago

5

Complete the steps to factor 56x2 – 8x – 7x + 1 by grouping.

1 answer:

solmaris [256]4 years ago

7 0

you dont use the distributive property

(8x-1)(7x-1)

then you foil it and combine like terms

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Using the discriminant , how many real solutions does the following quadratic equation have?

Andreyy89

Hi,

Work:

Equation;

$2 {x}^{2} + 7x - 15 = 0$

Solving:

$2x^{2} + 7x - 15 = 0 \\ 2 {x}^{2} + 10x - 3x - 15 = 0 \\ 2x \times (x + 5) - 3x - 15 = 0 \\ 2x \times (x + 5) - 3(x + 5) = 0 \\ (x + 5) \times (2x - 3) = 0 \\ \\ x + 5 = 0 \\ 2x - 3 = 0 \\ \\ x = - 5 \\ x = \frac{3}{2}$

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Hope this helps.
If you need any additional explanation comment below and I'll reply.
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