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h(4.5)=-16(4.5)^2+256
We move all terms to the left:
h(4.5)-(-16(4.5)^2+256)=0
We add all the numbers together, and all the variables
h(4.5)+68=0
We multiply parentheses
4.5h+68=0
We move all terms containing h to the left, all other terms to the right
4.5h=-68
h=-68/4.5
h=-15+0.5/4.5
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