Solve: 104 times 105 A)10900 B)10290 C)10920 D)10090

tenelhemcqr

tenelhemcqr

Answered question

2022-12-06

Solve: 104 × 105
A)10900
B)10290
C)10920
D)10090

Answer & Explanation

gamspoupshua

gamspoupshua

Beginner2022-12-07Added 6 answers

The right answer is A, 10920
104 × 105 = ( 100 + 4 ) ( 100 + 5 )
Assuming the identity
(x+a)(x+b)
= x 2 + ( a + b ) x + a b
= 100 2 + ( 4 + 5 ) 100 + 4 × 5
=10000+400+500+20
=10000+900+20
=10920

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