Answer:
Step-by-step explanation:
Area of a triangle: .5(b*h)
which means that
.5(4(x-1)*(2x+5))=30
mulitply the two equations
(4x-4)(2x+5) = 8x²+12x-20
distribute the 1/2
.5(8x²+12x-20)
4x²+6x-10 = 30
divide both sides by 2
2x²+3x-5= 15
move everything to one side
2x²+3x-20=0
not sure if you need to solve it but x= 2.5 or x= -4
