Question

the number of zeros in -2x²+ 7 - 3​

Answer 1

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Answer 2

10 is a factor of 5 and 2. In these type of questions you need to know how many 5s and 2s are there in the product. If x is the number of 5s and y the number of 2s, minimum of x and y would be the number of zeroes in any product. In this question

15*32*25*40*75*98*112*125

15 - one 5

32 - five 2s

25 - two 5s

40 - three 2s and one 5

75 - one 3 and two 5s

98 - one 2 and two 7s

112 - four 2s and one 7

125 - three 5s

In total: thirteen 2s and nine 5s.

Minimum of 13 and 9 is 9, which is the number of zeroes in the product.