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L = H - 24
L = low temperature.
H = High Temperature = 92 degrees
L = 92 - 24
L = 68
You need to expand (4x-7)(x+3), multiplying each term in the first bracket by each term in the second bracket, in order to get 4x^2+5x-21. Hope that helps!
X=4 x=-4 Due to the difference in squares theorem