Factor x2 + 8.0 + 15
A. (x+8)(x+15)
B. (x+3)(x+5)
C. (x+6)(x+20)

B. (x+3)(x+5)

x^2 + 8.0 + 15 is a standard form equation (ax^2 + bx + c). When factoring standard form equations that have a coefficient of one, you want to find two numbers that add to "b" and multiply to "c". In this case, 3 + 5 equals 8.0 which is your b-value, and 3 x 5 equals 15 which is your c-value.

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)