Tick (✓) the correct answer:

Question:

Tick (✓) the correct answer:

If x = 10, then the value of (4x2 + 20x + 25) = ?

(a) 256

(b) 425

(c) 625

(d) 575

Solution:

(c) 625

$\left(4 x^{2}+20 x+25\right)$

$\Rightarrow(2 x)^{2}+2(2 x)(5)+(5)^{2}$

$\Rightarrow(2 x+5)^{2}$

$\Rightarrow(2(10)+5)^{2}$

$\Rightarrow(20+5)^{2}$

$\Rightarrow(25)^{2}$

$\Rightarrow 625$

 

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