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### MEAP Preparation - Grade 7 Mathematics2.58 Addition of Trinomials - I

 Add the given equations using the "Horizontal Method." Example: 7x-5y+4a, -5z+2b-x and -3x+2y-b. Solution: Summing the expressions, (7x-5y+4a)+(-5z+2b-x)+(-3x+2y-b) Associative Law allows us to rewrite the expressions to bring the like-terms together as shown below, [7x+(-x)] + [(-5y)+2y] + (-5z) + [4a+(-3a)] + [2b+(-b)] = [7+(-1)]x + [(-5)+2]y + (-5z) + [4+(-3)]a + [2+(-1)]b = 6x-3y-5z+a+b Directions: Given the following expressions, find the values of the addition combinations given in the questions. A=5p2-3q2+r2, B=-2q2+3p2-4r2, C=-7r2+3p2+2q2, P= x+y-z, Q=y+z-x, and R=z+x-y
 Q 1: R + P = _____ ?2y2x2zx+y+z Q 2: B + C = _____ ?11rp2-3q2-10r28p2-5q2-3r262-11r28p2-q2-6r Q 3: C + A = _____ ?11rp2-3q2-10r28p2-5q2-3r262-11r28p2-q2-6r2 Q 4: P + Q + R = _____ ?2y2x2zx+y+z Q 5: A + B = _____ ?11rp2-3q2-10r262-11r28p2-5q2-3r28p2-q2-6r Q 6: Q + R = _____ ?2zx+y+x2y2x Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!