SOLUTION: A rectangular solar panel is 42cm by 28cm by adding the same amount to each dimension the area is doubled how much is added

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Question 1027628: A rectangular solar panel is 42cm by 28cm by adding the same amount to each dimension the area is doubled how much is added
Answer by ikleyn(52779) About Me  (Show Source):
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A rectangular solar panel is 42cm by 28cm by adding the same amount to each dimension the area is doubled how much is added
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The area of (42, 28) panel is the product 42*28 cm%5E2.

The area of the extended panel (42+x, 28+x) panel is the product (42+x)*(28+x).

The condition says that

(42+x)*(28+x) = 2*42*28.

It is the quadratic equation for x.

Can you simplify and solve it for x?