
By the quadratic formula,

Then


Multiply numerator and denominator by the denominator's conjugate:

Answer:
132 cm²
Step-by-step explanation:
Your welcome
If an is 18 and as is half its length it would be 9, AD = 9
Answer: x=2
Step-by-step explanation:
first subtract 3x from both sides
then your equation will be 8x-7=9 then you will add 7 to both sides getting 8x=16 then divide both sides by 8 and x=2