If a2 + 4a + x = (a + 2)2, find the value of x.
Answer :
It is given that
a2 + 4a + x = (a + 2)2
By expanding using formula
a2 + 4a + x = a2 + 22 + 2 × a × 2
By further calculation
a2 + 4a + x = a2 + 4 + 4a
So we get
x = a2 + 4 + 4a – a2 – 4a
x = 4
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