You roll a die and pick a card of the two-card set with values 6 and 7. How many DIFFERENT sums are possible? Hint: list all with tree diagram and cross out repeated sums

The die is 1 2 3 4 5 or 6

The card is 6 or 7

Possible sums are

card=6)  1+6=7, 2+6=8, 3+6=9, 4+6=10, 5+6=11, 6+6=12,

card=7)   1+7=8, 2+7=9, 3+7=10, 4+7=11, 5+7=12, 6+7=13

We get seven different sums:  7 8 9 10 11 12 13

7

step-by-step explanation:

equation

you are asked to write the equation

  expression = 0

using the given expression. when you do that, you have

  2x^2-2x-12 = 0

factoring

you can see that each of the coefficients is even, so a factor of 2 can be removed immediately.

  2(x^2 -x -6) = 0

if you multiply the binomials (x+a)(x+b), you get

  (x +a)(x +b) = x^2 +(a+b)x +ab

this tells you the coefficient of x is the sum of two factors of the constant term. here, that means -1 is the sum of two factors of -6. we want to know those factors so we can factor the trinomial.

  -6 = -1×6 = -2×3 = -3×2 = -6×1

the factor pair that sums to -1 is {-3, 2}, so our factorization is

  2(x -3)(x +2) = 0

solutions

the solutions to this equation are the values of x that make the product zero. a product is zero only when only of the factors of the product is zero. here, that means

  x - 3 = 0

  x = 3 . . . add 3 to both sides of the equation

or

  x +2 = 0

  x = -2 . . . add -2 to both sides of the equation

the solutions to the equation are x=3 or x=-2. both of these values of x satisfy the equation—they make it be true.

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step-by-step explanation:

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