Note: on 11,12, and 13, factor out an x. For example on 11 x(x^2-9x) then graph. Without a calculator, name the zeros (include multiplicity is any) and sketch the graph.
11. f(x) = x*3 - 9x^2
12. f(x) = x*3 - 4x^2 - 5x
13. f(x) = 2x^3 + 7x - 4x
14. f(x) = -3x(x -- 4)(x+3)^2
15. f(x) = 5x(x - 2)²(x - 5)

we have three similar triangles, because each has a right angle and shares an angle.   let's write the angles in order: opposite to short leg, long leg, hypotenuse.

cab similar to bad similar to cbd

or as ratios,

ca: ab: cb = ba: ad: bd = cb: bd: cd

we also know

ac = ad + cd

(ad+cd): ab: cb = ba: ad: bd = cb: bd: cd

(ad+cd)/cb=cb/cd

we have cb=6, ad=5 and seek x=cd.

we reject the negative root and conclude x=4

answer: 4

c.

step-by-step explanation:

she should of added 9^2 and 12^2. that is because it is a^2+b^2=c^2. c^2 is the hypotenuse and should always be bigger than the other two numbers. which is why she should of added 9 squared and 12 squared together instead of 15 squared.

6(h+1)/2=a

a=area

step-by-step explanation:

its the same thing as a square or rectangle but after multiplying two sides you need to divide it by two.