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-21 = a - 2(8) because the graph passes through (8,
-21)
a = -21 + 16 = -5 answer
To write the number is standard form we need to move the decimal point six times to the right, then:
therefore the answer is b.
Answer:
The parabola will reflect over the x axis.
Step-by-step explanation:
By setting the "a" value to a negative number, you will be inverting the f(x) values, in other words making a parabola open downwards, or a direct reflection over the x axis of the parent formula.
Take f(x)=1x^{2}+0 for example.
if we plug in 1 for x f(x) will equal 1
however if we make the a value negative
f(x)= -1x^{2}+0
and set x equal to 1,
you should see that f(x) is now -1
Using y=mx+b, the slope is -2/3 and the y-intercept is -2
y=-(2/3)x -2
