Question

Find 5•1×5•2 ; 103×104 using the formula (x+a) ( x+b )​

Answer 1

Step-by-step explanation:

(x+a) (x+b) = x2 +x(a+b)+ab

(100+3) (100+4) =100(2)+100(3+4)+3*4

=1000+700+12

=1712

Answer 2

Answer:

$(x + a)(x + b) \\ x2 + (a + b)x + ab \\ (100 + 3)(100 + 4) \\ \\ (100)2 + (3 + 4)100 + 3 \times 4 \\ 10000 + 700 + 12 \\ = 10712$