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natita [175]
4 years ago
11

If f(x) = 3x 7, find f(a - 1) a. 3a 6 b. 3a 4 c. 3a 8 d. 3a 10

Mathematics
1 answer:
Rom4ik [11]4 years ago
5 0
Hello,

Let's suppose f(x)=3x+7
f(a-1)=3(a-1)+7=3a-3+7=3x+4
Answer B with a sign "++++++++++++++++++++++++++++"


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Find the x-intercept(s) of y = 2x2 - 3x - 5.<br> A) -5 <br> B) 2 1/2, -1<br> C) 3, -5 <br> D) 5, -1
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\large\boxed{B)\ 2\frac{1}{2},\ -1}

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x-intercepts are for y = 0.

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2x^2-3x-5=0\\\\2x^2+2x-5x-5=0\\\\2x(x+1)-5(x+1)=0\\\\(x+1)(2x-5)+0\iff x+1=0\ \vee\ 2x-5=0\\\\x+1=0\qquad\text{subtract 1 from both sides}\\\boxed{x=-1}\\\\2x-5=0\qquad\text{add 5 to both sides}\\2x=5\qquad\text{divide both sides by 2}\\\boxed{x=2\frac{1}{2}}

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3 years ago
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