3 years ago

-7(2b-4)=5(-2b+6)?Please help me i need the answer its hard!

Mathematics

1 answer:

bija089 [108]3 years ago

5 0

-14b+28=-10b-30
-4b+28=-30
-4b=-58
b=58/4=29/2

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Rewrite <br><img src="https://tex.z-dn.net/?f=%20%7Bcos%7D%5E%7B4%7D%20x" id="TexFormula1" title=" {cos}^{4} x" alt=" {cos}^{4}

erastovalidia [21]

All you need is the double angle identity:

$\cos^2x=\dfrac{1+\cos2x}2$

So we have

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Apply the identity again to the squared term:

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iogann1982 [59]

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VladimirAG [237]

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Read 2 more answers

Compare the two expressions

Art [367]

Yes, they are equivalent
6+7-5=8. -5+10+3=8

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3 years ago