Answer:
all work is shown and pictured
Answer:

Step-by-step explanation:
Given

Required
Express as a binomial squared

Rewrite as:

Expand

Factorize:

Factor out 0.4x + 6y

Express as a square:

You have to multiply your 20cm by 6cm and your final answer being 120 because 0 times 6 is zero and 2 times 6 is 12, then that getting you 120
So hmm check the picture below


part 1)
it takes

part 2)

it will reach the maximum height at

how much higher than before is that? well, what was the y-coordinate for when the vₒ was 64? what did you get for

?
subtract that from this height when vₒ is 128 or doubled, to get their difference, that's how much higher it became