Tick $(✓)$ the correct answer in each of the following:
$(2 x + 5) (2 x - 5) = ?$
(a) $(4 x^{2} + 25)$
(b) $(4 x^{2} - 25)$
(c) $(4 x^{2} - 10 x + 25)$
(d) $(4 x^{2} + 10 x - 25)$

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Solution

$(2 x + 5) (2 x - 5) = (2 x)^{2} - (5)^{2} = 4 x^{2} - 25$

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