Question

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Evaluate:
1) (2a + 0.5)(7a -0.3)​

Answer 1

Step-by-step explanation:

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Answer 2

$\bf{evaluate \implies(2a + 0.5)(7a -0. 3) } \\ \\ \\ \longrightarrow \bf{(2a \times7 a ) +(2 a\times - 0.3) + (0.5 \times 7a) + (0.5 \times -0. 3)} \\ \\ \\ \bf{\longrightarrow14 {a}^{2} - 0.6a + 3.5a } - 0.15 \\ \\ \\ \longrightarrow \boxed{ \bf{ \therefore \: \: \: \: 14 {a}^{2} +2.9a - 0.15 }} \\ \\ \\ \\ \\ \bf{identity \: used} \implies\boxed{ \bf{ {a}^{2} + {b}^{2} - 2ab}}$