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Secondary 1 | Maths
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Isaac
Isaac

Secondary 1 chevron_right Maths chevron_right Singapore

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Date Posted: 2 years ago
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Daniel Poon
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27 answers (Tutor Details)
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Notice that the height of triangle ADF is equal to AE, which is the side of the square. So AE = 3x + 2. Use the formula for the area of a triangle, but remember that the base of the triangle is DF and not just DE!

Once you have found the area of ADF in terms of x, solve for x. Remember that the expansion of (ax + b)^2 is (a^2)(x^2) + 2(ax)(b) + b^2. Use this identity to find the area of the square in terms of x, then substitute the value of x to obtain the numerical answer.