ananya37933 ananya37933

16-07-2020
Mathematics

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Using (x + a) (x + b) = x² + (a + b) x + ab, evaluate 75 x 77

Respuesta :

lucasella lucasella

16-07-2020

(x + a) (x + b) = x² + (a + b) x + ab

75 * 77=

=(70+5)(70+7)

=70²+(5+7)*70+5*7

=4900+12*70+35

=4900+840+35

=5775

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