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Sagot :
Step 1:
Concept: use the formula below to find the length snd base of a triangle.
[tex]\text{Area of a triangle = }\frac{Base\text{ }\times\text{ Height}}{2}[/tex]Step 2:
Given data
Area of a triangle = 30 square meters
Let the base = x
Height = x - 4
Step 3:
Substitute the values in the formula
[tex]\begin{gathered} 30\text{ = }\frac{x(x-4)}{2} \\ \text{Cross multiply} \\ x(x\text{ - 4) = 30}\times2 \\ x^2\text{ - 4x = 60} \\ x^2\text{ - 4x - 60 = 0} \\ x^2\text{ -10x + 6x - 60 = 0} \\ x(x\text{ - 10)+6(x - 10) = 0} \\ (x\text{ + 6)(x - 10) = 0} \\ \text{x = -6 or 10} \\ x\text{ = 10} \end{gathered}[/tex]Final answer
Base = 10 m
Height = 10 - 4 = 6 m
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