The cost of each book is increased by 2$. The number of book which are bought for 40$ are now less than before. Write down an expression in x and show that it simplifies to x^2 +2x - 80 = 0
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3
Answer:
sorry I am so weak in mathematics
Answered by
1
Answer:
Step-by-step explanation:
40/(x+2) is less than 40/x by one so add one to it and they will be equal
so: 40/(x+2) + 1 = 40/x Multiply both sides by x(x+2)
40x +x(x+2) = 40(x+2) or
40x +x^2 +2x = 40x+80
or
x^2 + 2x -80 = 0
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