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Sagot :
Answer: (-4,0) , (1,0)
Step-by-step explanation:
I used this website called Desmos it could help with your questions like this.
Answer:
Step-by-step explanation:
f(x)=x³+2x²-7x+4
at x=1
f(1)=1³+2(1)²-7(1)+4=1+2-7+4=0
so x=1 is one zero.
1) 1 2 -7 4
| 1 3 -4
___________
1 3 -4 |0
x²+3x-4=0
x²+4x-x-4=0
x(x+4)-1(x+4)=0
(x+4)(x-1)=0
x=-4,1
zeros are -4,1,1
coefficient of leading term is +
so it starts from bottom on the left at ends up on the right.
There is a cusp at x=1
or it decreases on left of 1 and and increases on the right.
at x=-4 ,it increases.
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