Question

If f(x+5)=x^2+kx+30 what is K equalled to?

Answer 1

9 = 2^2 - 2k - 3 9 = -2k + 4 - 3 9 - 4 + 3 = -2k 8 = -2k Divide by -2 k = -4

Answer 2

f(x+5) means for every x, it is x+5

ok so since it is 2nd degree, we do exponent
f(x)=x^2
f(x+5)=(x+5)^2=x^2+10x+25
we need 5 more
f(x)=x^2+5
f(x+5)=x^2+10x+25+5=x^2+10x+30
k=10