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givi [52]
4 years ago
12

Use the discriminant to find the number of real roots in Y = x^2 – 6x + 9

Mathematics
1 answer:
BaLLatris [955]4 years ago
4 0
So discriminant is being counted from that equation:
b^2-4ac = 36-36 = 0

As discriminant is 0, then there is just 1 root -> -b/2a = 6/2 = 3.
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If f(x) =3x-5 them find values of f(3) and f(-7). please explain step by step​
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Answer:

f(3) = 4

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Step-by-step explanation:

Hi there!

f(x) =3x-5

To find f(3), replace every x with 3:

f(3) =3(3)-5\\f(3) =9-5\\f(3) =4

Therefore, f(3)=4.

f(x) =3x-5

To find f(-7), replace every x with -7:

f(-7) =3(-7)-5\\f(-7) =-21-5\\f(-7) =-26

Therefore, f(-7)=-26.

I hope this helps!

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2 years ago
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