Question

using (x+a) (x+b) = x²+(a+b)x+ab
(7.2 X 7.3)
Find​

Answer 1

Answer:

(7 + 0.2) (7 + 0.3)

= 7² + (0.2 + 0.3) × 7 + (0.2 × 0.3)

= 49 + 3.5 + 0.06

= 52.56

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Answer 2

$\bf{To \: solve: } \sf{ \: (7.2)(7.3)}$

$\bf{Identity \: to \: be \: used : } \\ \sf{(x + a)(x + b) = {x}^{2} + (a + b)x + ab }$

$\bf{Solution : }$

$\sf{:: \implies (7.2)(7.3) = (7 + 0.2)(7 + 0.3)} \\ \sf{:: \implies(7.2)(7.3) = {7}^{2} + (0.2 + 0.3)7 + (0.2 \times 0.3 )}$

$\sf \blue{ :: \implies(7.2)(7.3) = { 52.56 }}$