1 A rectangular picture frame has perimeter 70 cm.
a The width of the frame is x cm. Find an
expression, in terms of x, for the height
of the frame.
b Find an equation for the area of the
frame, Acm2, in terms of x.
C Plot the graph which shows how A
varies with x. Use a suitable domain and
range. Hence sketch the graph on paper
d Find the x-intercepts of the graph in part
e State what these two values of x represer
f Hence find the equation of the graph's
line of symmetry, and state what this
tells you in the context of the problem

good luck!

cutie~

answer: ask

step-by-step explanation:

x= -3 and

step-by-step explanation:

to find the roots of a cubic, use division or factoring to find the factors then set equal to 0. as this is a difference of cubes, it factors into

where a is the cube root of .

here   this is 27 and the cube root of 27 is 3. so we write using the form:

.

set each factor to 0 and solve for x.

x-3=0

x=3

the quadratic expression does not factor and must be solved using the quadratic formula.

where a = 1, b=3, and c=9

this cubic has two complex roots.

i dont know

step-by-step explanation: