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3 years ago

Evaluate-2w^2 +5 for w=4

Mathematics

2 answers:

Aneli [31]3 years ago

8 0

Answer:

-27

Step-by-step explanation:

Substituting 4 for w in the expression -2w² + 5 yields:

-2(4)² + 5

= -2(16) + 5

= -32 + 5

= -27

AveGali [126]3 years ago

4 0

-27 should be your answer. Here is my work...

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Answer:

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Step-by-step explanation:

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3 years ago

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MatroZZZ [7]

Answer:

Step-by-step explanation:

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2 years ago

1. Match the polynomial identity to the correct answer.

Katen [24]

Answer:

$a: (a-b)(a+b);b: (a-b)(a^{2}+ab+b^{2}); c: (a^{2} +2ab+b^{2}); d: (a+b)(a^{2}- ab+b^{2})$

Step-by-step explanation:

Given the expressions all that is required is to expand them (using the distributive property) to see which answers they match up to:

For a: $(a-b)(a+b)=a^{2} +ab-ab-b^{2} =a^{2}-b^2$

For b: $(a-b)(a^2+ab+b^2)=a^3+a^2b+ab^2-a^2b-ab^2-b^3=a^3-b^3$

For c calculate the square of a sum: $(a+b)^2=a^2+ab+ab+b^2$

(add like terms) c: $a^2+2ab+b^2$

For d: $(a+b)(a^2-ab+b^2)=a^3-a^2b+ab^2+a^2b-ab^2+b^3$ $=a^3+b^3$

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3 years ago