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Ugo [173]
3 years ago
8

Which equations are correct? Select each correct answer.

Mathematics
2 answers:
netineya [11]3 years ago
6 0
The answer to the question is the second and the fourth equations
sp2606 [1]3 years ago
3 0

Answer:  The correct equations are

(b)~5x^3(6x^4)=30x^7,\\\\(d)~5y^4(2y^5)=10y^9.

Step-by-step explanation:  We are given to select the correct equations from the following :

(a)~3b^3(-2b^4)=-6b^{-12},\\\\(b)~5x^3(6x^4)=30x^7,\\\\(c)~4c^4(3c^2)=12c^8,\\\\(d)~5y^4(2y^5)=10y^9.

We will be using the following property of exponents :

a^b\times a^c=a^{b+c}.

We have

For equation (a)

L.H.S.=3b^3(-2b^4)=-6b^{3+4}=-6b^7\neq-6b^{12}=R.H.S.

So, this equation is not correct.

For equation (b)

L.H.S.=5x^3(6x^4)=30x^{3+4}=30b^7=R.H.S.

So, this equation is CORRECT.

For equation (c)

L.H.S.=4c^4(3c^2)=12c^{4+2}=12c^6\neq12c^8=R.H.S.

So, this equation is not correct.

For equation (d)

L.H.S.=5y^4(2y^5)=10y^{4+5}=10y^9=R.H.S.

So, this equation is CORRECT.

Thus, the correct equations are

(b)~5x^3(6x^4)=30x^7,\\\\(d)~5y^4(2y^5)=10y^9.

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