Answer:
(x + 2)(2x + 2) = 110; x = 5.93 mf2
Step-by-step explanation:
mf2
Answer:
5.93m
Step-by-step explanation:
I don't know what's happening exactly in a) but I solved b) by completing the square for you. See the attached image for my exact working.
Firstly I expanded the quadratic and then rearranged to get the equation
x^2 + 3x = 53
Then I halved the multiplier of the middle term and added the square of the result to both sides. I.e. I added 1.5^2 to both sides of the equation.
Then i factorised the left side of the equation into a perfect square (x+1.5)^2. This can be mentally checked by using the "SAM" method. 1.5+1.5=3, which is the middle term of the expanded equation, and 1.5×1.5 = 1.5^2 = 2.25.
So we have the equation (x+1.5)^2 = 55.25
Next square root both sides and do some rearranging to get x = 5.93
Hope this helps ☺️
Side note: Theoretically, -7.433 is also the square root of 55.25, but using this value would result in a negative answer. As this question appears to be about areas and areas can't be negative, I'd keep away from using -7.433 and just stick to 7.433.
