Current location - Training Enrollment Network - Mathematics courses - The topic of quadratic function type in grade nine (the topic is below). Thank you. There must be steps and solutions!
The topic of quadratic function type in grade nine (the topic is below). Thank you. There must be steps and solutions!
What is 1)y? Not clear! That may be profit.

y=(4+x)( 10-x)=40-4x+ 10x-x^2=-x^2+6x+40

2) Q=aπ(D/2)^2=aπD^2/2

3)

When m 2-5m+7 = 1, that is, m=2 or 3, this function is linear.

When m 2-5m+7 =1,that is, m=2, this function is a proportional function.

When m 2-5m+7 = 2 and m = (5 √ 5)/2, this function is a quadratic function.

4) When x=2, the minimum value is -4.

When x=0, the maximum value is 0.

5) Because y = ax 2 is symmetrical about y, (x 1, 5) and (x 2, 5) are symmetrical points.

So x 1+x2=0,

So when x=x 1+x2=0, the value of y is 0.