Presentation on theme: "Evaluate the expression for the given value(s) of the variable(s)."— Presentation transcript:
1 Evaluate the expression for the given value(s) of the variable(s). Example 4Evaluating Algebraic ExpressionsEvaluate the expression for the given value(s) of the variable(s).3x+4,x=7a.–s=2,b.p410s 33p 2,SOLUTION3x+4=3a.()7Substitute 7 for x.=21+4Multiply.=25Add.
2 Example 4 b. 10s 3 – 3p 2 = 10 ( ) 3 2 – 3 ( ) 2 4 = 10 ( ) 8 – 3 16 = Evaluating Algebraic Expressionsb.10s 3–3p 2=10() 32–3() 24Substitute 2 for s and 4 for p.Evaluate powers.=10()8–316=80Multiply.–48=32Subtract.
3 Example 5Evaluating a Real-Life ExpressionWATERFALLA river carries a stone over a waterfall. The stone hits the water 5 seconds later. To find the height of the waterfall, use the expression 16t2, which gives the distance in feet that a dropped object falls in t seconds.SOLUTION16t 2=16() 25Substitute 5 for t.Evaluate the power.16()25==400Multiply.
4 The waterfall is about 400 feet high. Example 5Evaluating a Real-Life ExpressionANSWERThe waterfall is about 400 feet high.
5 Evaluate the expression for the given value(s) of the variable(s). Guided Practicefor Examples 4 and 5Evaluate the expression for the given value(s) of the variable(s).17.4r+6,r=5ANSWER2618.(),5–y3=8ANSWER919.n2+q3,n=1,q2ANSWER9
6 Guided Practice 20. WHAT IF? for Examples 4 and 520. WHAT IF?In Example 5, suppose the stone hits the water after 2 seconds. Find the height of the waterfall.ANSWER64 ft
Your consent to our cookies if you continue to use this website.