3 years ago

What is -3-(-4)? i think i'm confused

Mathematics

1 answer:

Leokris [45]3 years ago

6 0

Since it is two negatives you are actually adding so -3 +4 would equal 1

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Rudik [331]

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Combine like terms

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3 years ago

Read 2 more answers

How do you solve this equation: -2m+3=|15+m|

Elden [556K]

Any number inside the modulus sign becomes positive. This means $|15+m|=|-(15+m)|=|-15-m|$ and so we have,

$-2m+3=|15+m| \Rightarrow \left \Big\{ {{-2m+3=15+m} \atop{-2m+3=-15-m}} \right$

Solving these gives us

$-2m+3=15+m \Rightarrow m=-4$

$-2m+3=-15-m \Rightarrow = m=18$

However if we check the second solution in the original equation we obtain $-2(18)+3=|15+18| \Rightarrow -33=33$ . This is false and so $m=18$ can't be a solution.

Therefore the only solution is $m=-4$ .

(Note: I'm not sure why the second solution didn't work but when there's a modulus sign involved it always pays to check your final answers to be sure. I'll have a think about it but in case you find out before I do, I'd be interested to know in the comments.)

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3 years ago

If −1 is a zero of the polynomial p(x)=ax^3−x^2+x+4, find the value of a.

vitfil [10]

Answer:

a = 2

Step-by-step explanation:

given x = - 1 is a zero then f(- 1) = 0 , that is

a(- 1)³ - (- 1)² - 1 + 4 = 0

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a = 2

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This question is not that hard but I’m getting rushed

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14:21 one is the right answer

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Answer:

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One small pizza costs $5.95 each. 2 pizzas equal $11.90. $15.00 minus $11.90 equals $3.10.

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3 years ago