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3 years ago

(-4)(5)+(-3)(-2) whats is it???

Mathematics

2 answers:

Vlada [557]3 years ago

5 0

Answer:

-14

Step-by-step explanation:

(-4)(5)+(-3)(-2)

=-20+6

=-14

joja [24]3 years ago

3 0

Answer:

-14

Step-by-step explanation:

Remember to follow PEMDAS. First multiply, then add.

Note:

If you multiply two negative numbers, the answer will be positive.

If you multiply one negative & one positive, the answer will be negative.

If you multiply two positive numbers, the answer will be positive.

(-4) * (5) = -20

(-3) * (-2) = 6

Add:

-20 + 6 = -14

-14 is your answer.

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Step-by-step explanation:

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Solving using the quadratic formula:

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$\displaystyle \\a=-\frac{1}{4}\\b=7\\c=-24$

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$\displaystyle\\x=\frac{-7\pm \sqrt{7^2-4\left(-\frac{1}{4}\right)\left(-24\right)}}{2\left(-\frac{1}{4}\right)}\\\\x=\frac{-7\pm \sqrt{25}}{-\frac{1}{2}}\\\\\begin{cases}x=\frac{-7+5}{-0.5}=\frac{-2}{-0.5}=\boxed{4}\\x=\frac{-7-5}{-0.5}=\frac{-12}{-0.5}=24 \:(\text{Extraneous})\end{cases}$

Only $x=4$ works when plugged in the original equation. Therefore, $x=24$ is extraneous and the only solution is $\boxed{x=4}$

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