He endpoints of CD¯¯¯¯¯¯¯¯ are C(−4, 7) and D(0,−3).

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Ответ:

ayahabdulhaqq2

22.05.2020

Mathematics

3.5

Step-by-step explanation:

Write out quadratic

${x}^{2} - x + 8.75$

We are given that x+2.5 is a factor.

So our roots look like

(x + 2.5)(x - a)

Let apply the foil method to find some missing parts.

$x \times x = {x}^{2}$

$x \times - a = - ax$

$2.5 \times x = 2.5$

$2.5 \times - a = - 2.5a$

We know that the outer terms must multiply to 8.75. We also know that the middle terms must add up to -1.

- 2.5a = 8.75

2.5x - ax = -1

The only number that satisfy this equation is

- 3.5

Since it already negative, it is

3.5

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