Consider factors of 42, then if the factors can be added or subtracted.
42 = 42 * 1
42 = 21 * 2
42 = 14 * 3
42 = 7 * 6
Since none of these can be added or subtracted to equal 15, no intergers satisfy these criteria.
Using quadratic formula you can have a maximum of two solutions. When you set this problem equal to zero, your a=-1, b=-10, c=2
Answer:
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Step-by-step explanation:
Your friend is incorrect.
You should always count 0's when deciding where to place the decimal point. To disprove your friend, you could divide 1.2 by 8 and see that it doesnt equal 1.5. Also, 8 is multiplied by a value that is more than one, so the result should be higher than 8.
Good luck with your assignment!